Method for calculating structural electric field of transformer oil paper valve side winding and wire outlet device

Abstract

The embodiment of the invention provides a calculation method for a structural electric field of a transformer oil-paper valve side winding and an outlet device, and belongs to the technical field of transformer oil-paper valve side electric fields. Comprising the steps of constructing a transformer oil paper valve side winding model; acquiring parameters of an insulating paperboard in the transformer oil paper valve side winding model; acquiring a charge distribution curve on the insulating paperboard according to the parameters of the insulating paperboard; according to the method for calculating the structural electric field of the transformer oil paper valve side winding and the wire outlet device, a winding model or a wire outlet device model of the transformer oil paper valve side is constructed, then parameters of an insulating paperboard in the winding model or the wire outlet device model are obtained, and a charge distribution curve on the insulating paperboard is determined according to the parameters; the electric charge distribution curve is converted into the electric field of the insulating paperboard, the fringe effect of the paperboard is fully considered in the mode, and the precision of obtaining the electric field is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformer oil-paper valve side electric field, and in particular to a method for calculating the structural electric field of transformer oil-paper valve side windings and outlet devices. Background Art

[0002] The main function of the transformer oil-paper valve side winding electric field is to realize the conversion between AC and DC. In the rectifier transformer, the valve side winding converts AC into DC through the unidirectional conductivity of the diode. This conversion process is achieved by controlling the direction of the current.

[0003] In addition, the electric field of the valve-side winding and the electric field distribution of the outlet device in the oil-paper composite insulation structure will also affect the insulation performance of the transformer. During normal operation, the electric field in the oil-paper composite insulation is a mixed electric field of AC and DC. The complexity of the electric field distribution puts higher requirements on the insulation strength. Therefore, the analysis and research of the electric field of the oil-paper valve-side winding and the electric field of the outlet device of the transformer will help improve the performance and reliability of the transformer.

[0004] At present, the distribution of the electric field of the valve side winding and the electric field of the outlet device in the oil-paper composite insulation structure is generally measured by single-point charge density, which is equivalent to a constant current field. However, this method does not take into account the edge effect of the paperboard, resulting in low accuracy in obtaining the electric field.

[0005] The inventors of the present application discovered during the process of implementing the present invention that the above-mentioned solution in the prior art has the defect of low calculation accuracy of the structural electric field. Summary of the invention

[0006] The purpose of an embodiment of the present invention is to provide a method for calculating the structural electric field of a transformer oil-paper valve side winding and a lead-out device, which has the function of accurately obtaining the structural electric field.

[0007] In order to achieve the above object, an embodiment of the present invention provides a method for calculating the structural electric field of a transformer oil-paper valve side winding, comprising:

[0008] Construct transformer oil-paper valve side winding model;

[0009] Obtaining parameters of the insulating paperboard in the transformer oil-paper valve side winding model;

[0010] Acquire a charge distribution curve on the insulating paperboard according to the parameters of the insulating paperboard;

[0011] The electric field of the insulating paperboard is obtained according to the charge distribution curve.

[0012] Optionally, the parameters include length.

[0013] Optionally, obtaining a charge distribution curve on the insulating paperboard according to parameters of the insulating paperboard includes:

[0014] Dividing the insulating paperboard into equal intervals;

[0015] Labeling each interval on the insulating paperboard;

[0016] Obtaining the amount of charge in each interval on the insulating paperboard;

[0017] obtaining a charge density according to the charge amount;

[0018] A charge distribution curve on the insulating paperboard is obtained according to the charge density of each interval.

[0019] Optionally, obtaining the charge density according to the charge amount includes:

[0020] obtaining the charge volume within each of the intervals;

[0021] The charge density in each of the intervals is calculated according to formula (1):

[0022]

[0023] Among them, ρ i is the charge density of the ith interval, Q i is the charge of the ith interval, V i is the charge volume of the i-th interval, where i is an integer number.

[0024] Optionally, obtaining a charge distribution curve on the insulating paperboard according to the charge density of each interval includes:

[0025] obtaining the charge density of each of the intervals;

[0026] A least square method is used to perform curve fitting according to the charge density of each interval to obtain a charge distribution curve.

[0027] On the other hand, the present invention also provides a method for calculating the structural electric field of a transformer oil-paper valve side outlet device, comprising:

[0028] Construct the transformer oil-paper valve side outlet device model;

[0029] Obtaining parameters of the insulating paperboard in the transformer oil-paper valve side outlet device model;

[0030] Acquire a charge distribution curve on the insulating paperboard according to the parameters of the insulating paperboard;

[0031] The electric field of the insulating paperboard is obtained according to the charge distribution curve.

[0032] Optionally, the parameters include length.

[0033] Optionally, obtaining a charge distribution curve on the insulating paperboard according to parameters of the insulating paperboard includes:

[0034] Dividing the insulating paperboard into equal intervals;

[0035] Labeling each interval on the insulating paperboard;

[0036] Obtaining the amount of charge in each interval on the insulating paperboard;

[0037] obtaining a charge density according to the charge amount;

[0038] A charge distribution curve on the insulating paperboard is obtained according to the charge density of each interval.

[0039] Optionally, obtaining the charge density according to the charge amount includes:

[0040] obtaining the charge volume within each of the intervals;

[0041] The charge density in each of the intervals is calculated according to formula (2):

[0042]

[0043] Among them, ρ j is the charge density of the jth interval, Q j is the charge of the jth interval, V j is the charge volume of the jth interval, where j is an integer number.

[0044] Optionally, obtaining a charge distribution curve on the insulating paperboard according to the charge density of each interval includes:

[0045] obtaining the charge density of each of the intervals;

[0046] A least square method is used to perform curve fitting according to the charge density of each interval to obtain a charge distribution curve.

[0047] Through the above technical scheme, the method for calculating the structural electric field of the transformer oil-paper valve side winding and the outlet device provided by the present invention constructs a winding model or an outlet device model on the transformer oil-paper valve side, then obtains the parameters of the insulating paperboard in the winding model or the outlet device model, determines the charge distribution curve on the insulating paperboard according to the parameters, and converts the charge distribution curve into the electric field of the insulating paperboard. This method fully considers the edge effect of the paperboard and effectively improves the accuracy of electric field acquisition.

[0048] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0050] Figure 1 is a flow chart of a method for calculating the structural electric field of a transformer oil-paper valve side winding according to one embodiment of the present invention;

[0051] Figure 2 It is a flow chart of obtaining a charge distribution curve in a method for calculating a structural electric field of an oil-paper valve side winding of a transformer according to an embodiment of the present invention;

[0052] Figure 3 It is a flow chart of obtaining charge density in a method for calculating the structural electric field of a transformer oil-paper valve side winding according to one embodiment of the present invention;

[0053] Figure 4 It is a flow chart of obtaining the electric field of the insulating paperboard in the calculation method of the structural electric field of the transformer oil-paper valve side outlet device according to one embodiment of the present invention;

[0054] Figure 5 It is a flow chart of obtaining a charge distribution curve in a method for calculating a structural electric field of a transformer oil-paper valve side outlet device according to an embodiment of the present invention;

[0055] Figure 6 It is a flow chart of obtaining charge density in a method for calculating the structural electric field of a transformer oil-paper valve side outlet device according to one embodiment of the present invention;

[0056] Figure 7 It is a schematic diagram of a charge density curve of a transformer oil-paper valve side winding or an outlet device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0058] Figure 1 1 is a flow chart of a method for calculating the structural electric field of a transformer oil-paper valve side winding according to an embodiment of the present invention. Figure 1 In the calculation method, the calculation method may include:

[0059] In step S10, a transformer oil-paper valve side winding model is constructed.

[0060] In step S11, the parameters of the insulating paperboard in the transformer oil-paper valve side winding model are obtained, wherein the parameters of the insulating paperboard may include the length or width of the insulating paperboard, that is, the width in the electric field direction.

[0061] In step S12, the charge distribution curve on the insulating paperboard is obtained according to the parameters of the insulating paperboard. According to the width of the insulating paperboard in the electric field direction, the charge amount in the entire cross section of the insulating paperboard can be obtained, and the corresponding charge distribution curve can be obtained according to the charge amount. Specifically, the charge distribution curve of the insulating paperboard can be as follows: Figure 7 shown.

[0062] In step S13, the electric field of the insulating paperboard is obtained according to the charge distribution curve. After the charge distribution of the cross section of the insulating paperboard is obtained, the parameters of the electric field can be obtained.

[0063] In step S10 to step S13, the transformer oil-paper valve side winding model is first constructed, and then the parameters of the insulating paperboard in the transformer oil-paper valve side winding model are obtained, and the charge amount on the insulating paperboard is further obtained according to the parameters, and the charge distribution curve of the insulating paperboard cross section can be obtained according to the charge amount. The charge distribution curve reflects the charge flow of the electric field, and then the electric field parameters of the insulating paperboard can be obtained.

[0064] The distribution of the electric field of the valve side winding in the traditional oil-paper composite insulation structure generally adopts the method of measuring the charge density at a single point, which is equivalent to a constant current field. However, this method does not take into account the edge effect of the paperboard, resulting in low accuracy in obtaining the electric field. In this embodiment of the present invention, the method of converting the charge amount of the insulating paperboard cross section into a charge distribution curve is adopted, which fully takes into account the edge effect of the paperboard and effectively improves the accuracy of obtaining the electric field.

[0065] In this embodiment of the present invention, after obtaining the parameters of the insulating paperboard, it is also necessary to convert the charge amount on the insulating paperboard. The specific steps can be as follows: Figure 2 Specifically, Figure 2 In the calculation method, the calculation method may further include:

[0066] In step S20, the insulating paperboard is divided into equal intervals, wherein the intervals may include widths and are divided into equal intervals.

[0067] In step S21, each space on the insulating paperboard is numbered.

[0068] In step S22, the amount of charge in each interval on the insulating paperboard is obtained.

[0069] In step S23, the charge density is obtained according to the charge amount. After the charge amount in each interval is obtained, the corresponding charge density needs to be calculated.

[0070] In step S24, a charge distribution curve on the insulating paperboard is obtained according to the charge density of each interval.

[0071] In step S20 to step S24, the cross section of the insulating paperboard is first divided into equal intervals, the charge amount in each interval is obtained, and the charge amount is converted into charge density. After the charge density in each interval is obtained, since each interval is equal in spacing, the charge distribution curve of the cross section of the insulating paperboard can be obtained.

[0072] In this embodiment of the present invention, after obtaining the charge amount, it needs to be converted to obtain the charge density. The specific calculation steps can be as follows: Figure 3 Specifically, Figure 3 In the calculation method, the calculation method may further include:

[0073] In step S30 , the charge volume in each interval is obtained.

[0074] In step S31, the charge density in each interval is calculated according to formula (1):

[0075]

[0076] Among them, ρ i is the charge density of the ith interval, Q i is the charge of the ith interval, V i is the charge volume of the ith interval, where i is an integer number.

[0077] In this embodiment of the present invention, the charge distribution curve fitting step may include: first summarizing the charge density of each interval, and then using the least squares method to perform curve fitting according to the charge density of each interval to obtain the charge distribution curve. Specifically, the least squares curve fitting is a curve fitting method known to those skilled in the art.

[0078] On the other hand, the present invention also provides a method for calculating the structural electric field of the transformer oil-paper valve side outlet device. Specifically, the calculation method can be as follows: Figure 4 Specifically, Figure 4 In the calculation method, the calculation method may include:

[0079] In step S40, a transformer oil-paper valve side outlet device model is constructed.

[0080] In step S41, the parameters of the insulating paperboard in the transformer oil-paper valve side outlet device model are obtained, wherein the parameters of the insulating paperboard may include the length or width of the insulating paperboard, that is, the width in the electric field direction.

[0081] In step S42, the charge distribution curve on the insulating paperboard is obtained according to the parameters of the insulating paperboard. According to the width of the insulating paperboard in the electric field direction, the charge amount in the entire cross section of the insulating paperboard can be obtained, and the corresponding charge distribution curve can be obtained according to the charge amount. Specifically, the charge distribution curve of the insulating paperboard can be as follows: Figure 7 shown.

[0082] In step S43, the electric field of the insulating paperboard is obtained according to the charge distribution curve. After the charge distribution of the cross section of the insulating paperboard is obtained, the parameters of the electric field can be obtained.

[0083] In step S40 to step S43, a transformer oil-paper valve side outlet device model is first constructed, and then the parameters of the insulating paperboard in the transformer oil-paper valve side outlet device model are obtained, and the charge amount on the insulating paperboard is further obtained according to the parameters, and the charge distribution curve of the insulating paperboard cross section can be obtained according to the charge amount. The charge distribution curve reflects the charge flow of the electric field, and then the electric field parameters of the insulating paperboard can be obtained.

[0084] The distribution of the electric field of the valve-side outlet device in the traditional oil-paper composite insulation structure generally adopts the method of measuring the charge density at a single point, which is equivalent to a constant current field. However, this method does not take into account the edge effect of the paperboard, resulting in low accuracy in obtaining the electric field. In this embodiment of the present invention, the method of converting the charge amount of the insulating paperboard cross section into a charge distribution curve is adopted, which fully takes into account the edge effect of the paperboard and effectively improves the accuracy of obtaining the electric field.

[0085] In this embodiment of the present invention, after obtaining the parameters of the insulating paperboard, it is also necessary to convert the charge amount on the insulating paperboard. The specific steps can be as follows: Figure 5 Specifically, Figure 5 In the calculation method, the calculation method may further include:

[0086] In step S50, the insulating paperboard is divided into equal intervals, wherein the intervals may include widths and are divided into equal intervals.

[0087] In step S51, each space on the insulating paperboard is numbered.

[0088] In step S52, the amount of charge in each interval on the insulating paperboard is obtained.

[0089] In step S53, the charge density is obtained according to the charge amount. After the charge amount in each interval is obtained, the corresponding charge density needs to be calculated.

[0090] In step S54, a charge distribution curve on the insulating paperboard is obtained according to the charge density of each interval.

[0091] In step S50 to step S54, the cross section of the insulating paperboard is first divided into equal intervals, the charge amount in each interval is obtained, and the charge amount is converted into charge density. After the charge density in each interval is obtained, since each interval is equal in spacing, the charge distribution curve of the cross section of the insulating paperboard can be obtained.

[0092] In this embodiment of the present invention, after obtaining the charge amount, it needs to be converted to obtain the charge density. The specific calculation steps can be as follows: Figure 6 Specifically, Figure 6 In the calculation method, the calculation method may further include:

[0093] In step S60 , the charge volume in each interval is obtained.

[0094] In step S61, the charge density in each interval is calculated according to formula (2):

[0095]

[0096] Among them, ρ j is the charge density of the jth interval, Q j is the charge of the jth interval, V j is the charge volume of the jth interval, where j is an integer number.

[0097] In this embodiment of the present invention, the charge distribution curve fitting step may include: first summarizing the charge density of each interval, and then using the least squares method to perform curve fitting according to the charge density of each interval to obtain the charge distribution curve. Specifically, the least squares curve fitting is a curve fitting method known to those skilled in the art.

[0098] Through the above technical scheme, the method for calculating the structural electric field of the transformer oil-paper valve side winding and the outlet device provided by the present invention constructs a winding model or an outlet device model on the transformer oil-paper valve side, then obtains the parameters of the insulating paperboard in the winding model or the outlet device model, determines the charge distribution curve on the insulating paperboard according to the parameters, and converts the charge distribution curve into the electric field of the insulating paperboard. This method fully considers the edge effect of the paperboard and effectively improves the accuracy of electric field acquisition.

[0099] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0100] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0103] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0104] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0105] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0106] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0107] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for calculating the structural electric field of a transformer oil-paper valve side winding, characterized in that: include: Construct transformer oil-paper valve side winding model; Obtaining parameters of the insulating paperboard in the transformer oil-paper valve side winding model; Acquire a charge distribution curve on the insulating paperboard according to the parameters of the insulating paperboard; The electric field of the insulating paperboard is obtained according to the charge distribution curve.

2. The calculation method according to claim 1, characterized in that: The parameters include length.

3. The calculation method according to claim 2, characterized in that: Obtaining a charge distribution curve on the insulating paperboard according to the parameters of the insulating paperboard includes: Dividing the insulating paperboard into equal intervals; Labeling each interval on the insulating paperboard; Obtaining the amount of charge in each interval on the insulating paperboard; obtaining a charge density according to the charge amount; A charge distribution curve on the insulating paperboard is obtained according to the charge density of each interval.

4. The calculation method according to claim 3, characterized in that: Obtaining the charge density according to the charge amount includes: obtaining the charge volume within each of the intervals; The charge density in each of the intervals is calculated according to formula (1): Among them, ρ i is the charge density of the ith interval, Q i is the charge of the ith interval, V i is the charge volume of the i-th interval, where i is an integer number.

5. The calculation method according to claim 3, characterized in that: Obtaining the charge distribution curve on the insulating paperboard according to the charge density of each interval includes: obtaining the charge density of each of the intervals; A least square method is used to perform curve fitting according to the charge density of each interval to obtain a charge distribution curve.

6. A method for calculating the structural electric field of a transformer oil-paper valve side outlet device, characterized in that: include: Construct the transformer oil-paper valve side outlet device model; Obtaining parameters of the insulating paperboard in the transformer oil-paper valve side outlet device model; Acquire a charge distribution curve on the insulating paperboard according to the parameters of the insulating paperboard; The electric field of the insulating paperboard is obtained according to the charge distribution curve.

7. The calculation method according to claim 6, characterized in that: The parameters include length.

8. The calculation method according to claim 7, characterized in that: Obtaining a charge distribution curve on the insulating paperboard according to the parameters of the insulating paperboard includes: Dividing the insulating paperboard into equal intervals; Labeling each interval on the insulating paperboard; Obtaining the amount of charge in each interval on the insulating paperboard; obtaining a charge density according to the charge amount; A charge distribution curve on the insulating paperboard is obtained according to the charge density of each interval.

9. The calculation method according to claim 8, characterized in that: Obtaining the charge density according to the charge amount includes: obtaining the charge volume within each of the intervals; The charge density in each of the intervals is calculated according to formula (2): Among them, ρ j is the charge density of the jth interval, Q j is the charge of the jth interval, V j is the charge volume of the jth interval, where j is an integer number.

10. The calculation method according to claim 9, characterized in that: Obtaining the charge distribution curve on the insulating paperboard according to the charge density of each interval includes: obtaining the charge density of each of the intervals; A least square method is used to perform curve fitting according to the charge density of each interval to obtain a charge distribution curve.

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